Manchester terriers come in two sizes, as recognized by the American Kennel Club, the Standard size, which weighs between 12 and 22 pounds, and the Toy which weighs under 12 pounds. Manchester terriers, resembling small Dobermans, have sleek-looking black and tan short hairs, with a finely developed and rather sharp muzzle, and pointed upright ears.Terriers in general can sometimes pose difficulties as pets as they tend to be strong-willed, not always well mannered, and not usually good with children. Manchester terriers are in general better mannered and more easily trained than most other terriers, although they don’t always tolerate small children well. These dogs are not terribly aggressive, but will stand their ground and do not always act favorably towards roughhousing or the rough treatment smaller children are apt to innocently subject them to.